+# Marc21 008/22 : Target Audience (see UNIMARC 100/17-19)
+ta 1=8822
+ff8-22 ta
+aud ta
+audience ta
+
+## Indexes slightly different in Marc21 and UNIMARC (different meanings according to the type of the record => don't match a single UNIMARC field)
+## We can use it for UNIMARC to a first approximation
+# Marc21 008/18 : For Serials, frequency (see UNIMARC 110/1). For Books, Illustrations (see UNIMARC 100/0-3). For Maps, relief. For Music, Form of Composition. For Visual Materials, Running time.
+ff8-18 1=8818
+Frequency-code ff8-18
+
+# Marc21 008/18-21 : For Books, Illustrations (see UNIMARC 100/0-3). For Maps, relief. For Music (18-19), Form of Composition. For Visual Materials (18-20), Running time. For Serials (18), frequency
+ff8-18-21 1=8840
+Illustration-code ff8-18-21
+
+# Marc21 008/19 : For Serials, Regularity (see UNIMARC 110/2). For Music, Form of composition. For Books, illustrations. For Visual Materials, Running time
+ff8-19 1=8819
+Regularity-code ff8-19
+
+# Marc21 008/21 : For Serials, Type of serial (see UNIMARC 110/0). For Music, Music parts. For Maps, relief
+ff8-21 1=8821
+Type-Of-Serial ff8-21
+
+# Marc21 008/23 : For Books, Serials, Music, Mixed Materials, Computer files, Form of Item (see UNIMARC 106$a). For Maps, Projection
+ff8-23 1=8823
+format ff8-23
+
+# Marc21 008/24-27 : For Books, Nature of contents (see UNIMARC 105/4-7), for and Serials (24 only), Nature of contents (see UNIMARC 110/3). For Computer Files (26 only), type of file. For Music, Accompanying matter. For Maps (25 only), type of cartographic material
+# ff8-24-27 1=8841
+# Content-type ff8-24-27
+# Use ctype att (1034)
+
+# Marc21 008/28 : Government publication (see UNIMARC 100/20). except for Music, Accompanying matter
+ff8-28 1=8828
+
+# Marc21 008/29 : For Books and Serials, Conference code (see UNIMARC 105/8 and 110/7). For Maps and Visual Materials, Form of item
+ff8-29 1=8829
+Conference-code ff8-29
+
+# Marc21 008/30 : For Books, Festchrift indicator (see UNIMARC 105/9). For Music, Literary text for sound recordings
+ff8-30 1=8830
+Festschrift-indicator ff8-30
+
+# Marc21 008/31 : For Books and Maps, Index indicator (see UNIMARC 105/10). For Music, Literary text for sound recordings
+ff8-31 1=8831
+Index-indicator ff8-31
+
+# Marc21 008/33 : For Books, Literary form (see UNIMARC : 105/11). For Serials, Script of title (see UNIMARC 100/34-35). For Music, Transposition and arrangement. For Visual Materials, Type of visual materials. For Maps, Special format characteristics
+lf 1=8833
+lf lf
+fic lf
+Literature-Code lf
+
+# Marc21 008/34 : For Books, Biography. For Maps, Special format characteristics. For Continuing ressources, Entry convention. For Visual Materials, Technique. UNIMARC 105/12 : Biography code
+bio 1=8834
+biography bio
+ff8-34 bio
+Biography-Code bio
+
+## positions of Marc21 007 (1 byte)
+ff7-00 1=8700
+ff7-01 1=8701
+ff7-02 1=8702
+ff7-01-02 1=8703
+l-format ff7-01-02